Eric Snow <ericsnowcurren...@gmail.com> added the comment:

> The vulnerability is known since 2003 (Usenix 2003): read "Denial of
> Service via Algorithmic Complexity Attacks" by Scott A. Crosby and Dan
> S. Wallach.

Crosby started a meaningful thread on python-dev at that time similar to the 
current one:

  http://mail.python.org/pipermail/python-dev/2003-May/035874.html

It includes a some good insight into the problem.

----------
nosy: +eric.snow

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<http://bugs.python.org/issue13703>
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